Standard Print Formats
Paper sizes
The international standard for paper sizes (used worldwide with the exception of North America and parts of Latin America) is ISO 216. This includes the A series of paper sizes (e.g. A4, the most common of all paper sizes). It is based on an aspect ratio of √2:1, which means that when ISO 216 paper is folded in half lengthwise, each half of the paper will have the same aspect ratio as the original sheet.
This aspect ratio for paper is mentioned in a letter of 1786 which describes it as already being in common use among paper makers.
A1
594 x 841mm
A2
420 x 594mm
A3
297 x 420mm
A4
210 x 297mm
A5
148 x 210mm
A6
105 x 148mm
A7
74 x 105mm
Book sizes
More variety and disagreement exists when it comes to book sizing. Below are standard UK sizes as used by Canongate. n.b. These are trimmed page sizes.
Royal
234 x 153mm
Squat Royal
214 x 153mm
Demy
214 x 135mm
B format
198 x 129mm
Cut Down B format
178 x 129mm
A format
178 x 111mm